The direct shedding of piperazine rings is critical for the degradation of antibiotic persistent organic pollutants. In this work, nitrogen-deficient g-C₃N₄ loaded with polyoxometalates porous photocatalysts with P–N heterojunctions were carried out through the formation of chemical bonds between the nitrogen-deficient C⁺ in g-C₃N_x and the bridging oxygen in polyoxometalates (POMs), including phosphomolybdic acid (PMA), phosphotungstic acid (PTA) and silicotungstic acid (STA). The adsorption and photocatalysis experiments confirm the ability of the g-C₃N_x/POMs nanosheets to efficiently remove ciprofloxacin via the synergistic effects of adsorption and photo-catalysis. Approximately, g-C₃N_x/POMs-30 exhibits the optimal degradation ability, and the degradation rates of g-C₃N_x/PMA-30, g-C₃N_x/PTA-30 and g-C₃N_x/STA-30 could respectively reach 93.1%, 97.4% and 95.6% within only 5 min under visible light. The free radical scavenging experiment and ESR free radical capture experiments confirm that ·OH and ·O₂⁻ are free radicals that effectively degrade CIP. According to the results of the LC-MS analysis, the intermediates produced after CIP degradation and the efficient degradation pathway are proposed. The direct shedding of piperazine rings in the decarboxylation and defluorination process leads to the most efficient degradation of CIP into the small molecules.

哌嗪环的直接脱落对于抗生素持久性有机污染物的降解至关重要。在这项工作中，通过在gC ₃ N _x中的缺氮C ⁺与多金属氧酸盐（POMs）中的桥连氧之间形成化学键，进行了氮氧化物gC ₃ N ₄负载多金属氧酸盐多孔光催化剂与P–N异质结的连接。 ），包括磷钼酸（PMA），磷钨酸（PTA）和硅钨酸（STA）。吸附和光催化实验证实了gC ₃ N _x的能力/ POMs纳米片通过吸附和光催化的协同作用有效去除环丙沙星。大约，gC ₃ N _x / POMs-30表现出最佳的降解能力，并且gC ₃ N _x / PMA-30，gC ₃ N _x / PTA-30和gC ₃ N _x / STA-30的降解率分别达到在可见光下仅5分钟内达到93.1％，97.4％和95.6％。清除自由基的实验和ESR自由基捕捉实验证实，·OH和·O2 ₂ ^-是有效降解CIP的自由基。根据LC-MS分析的结果，提出了CIP降解后产生的中间体和有效的降解途径。哌嗪环在脱羧和脱氟过程中的直接脱落导致CIP最有效地降解成小分子。